Open Source Javascript PDF viewer [closed]
There is an open source HTML5/javascript reader available called Trapeze though its still in its early stages.
Demo site:https://brendandahl.github.io/trapeze-reader/demos/
Github page:https://github.com/brendandahl/trapeze-reader
Disclaimer:I'm the author.
You can use the Google Docs PDF-viewing widget, if you don't mind having them host the "application" itself.
I had more suggestions, but stack overflow only lets me post one hyperlink as a new user, sorry.